#box>li{
    width: 20vw;
    height: 20vw;
    border-radius: 8px;
    border: 1px solid black;
    padding: 10px;
}
.w100{
    width: 100%;
}

#box span{
    width: 2vw;
    height: 2vw;
    border-radius: 50%;
    background: black;
    display: block;
}